Professional-quality sterling silver-filled wire has a high-perceived value at a fraction of the cost of sterling silver. Sterling silver-filled wire is made of a durable outer layer of sterling silver surrounding a copper-alloy core and is finished with an anti-tarnish coating to preserve the beauty. Full-hard wire holds its shape for wire-wrapping jewelry. Its tempered nature holds intricate designs well while adding a brilliantly polished look. Sterling silver-filled wire handles like sterling silver and can be soldered.